7mos preg & bleeding, help!!!

Alrighty moms! I have been told over and over and over. By my mother ... Obgyn AND the hospital that its normal to spot... BUT I am in the third trimester ... Each time it happens its more and more blood on the TP !! They tell me its because sex. But my husband is out of town. I am enraged and HIGHLY concerned. I have pictures on the tp with blood but not posting unless any mom wants to be helpful and see and give their advice!